Abstract: A novel type of photo-thermo sensitive genic male sterile (PTGMS) rice line Yutu S labeled with green-revertible albino leaf color marker was developed from the leading PTGMS indica rice line Pei′ai 64S with 300 Gy ⁶⁰Co gamma rays irradiation of the dry seeds through continuous selections. The seedling charac ters of Yutu S were significantly worse than that of the wild type Pei′ai 64S , however the major agronomic characters, fertility characteristics, combining ability, disease resistance, and grain quality of Yutu S were similar to those of Pei′ai 64S in mature plant. Physiological compensation mechanism analysis showed that an increase in the activity of adenylate kinase and ribulose-1,5-bi sphosphate carboxylase was observed in the chloroplast of Yutu S during tiller ing, booting, and flowering stages. Genetic study indicated that the mutated gre en-revertible albino leaf color trait specially expressed at seedling stage wa s controlled by a single recessive gene. The prospe...更多cts of utilization of Yutu S in the two-line hybrid rice production were discussed.

Key words: green-revertible albino leaf marker, hybrid purity, photo-thermo sensitive genic male sterile line, hybrid rice, physiological tra its, agronomic characteristics, gene mapping

摘要： 以我国主栽的籼型光温敏核不育系培矮64S为起始材料，利用300 Gy的60Co-γ射线辐照干种子，经多代选择选育了一个携带白化转绿型叶色标记的新型不育系玉兔S。该不育系苗期性状明显比原亲本培矮64S差，但成熟期的主要农艺性状、育性特征、配合力、抗病性及稻米品质均与培矮64S相仿。补偿性生理机制研究表明，在分蘖、拔节和开花阶段玉兔S叶绿体内腺苷酸激酶和RuBP羧化酶的活性要比培矮64S高。遗传研究表明，白化转绿型突变性状受单隐性基因控制，并在幼苗阶段特异性表达。对不育系玉兔S在两系杂交水稻生产中的应用前景作了讨论。

关键词: 白化转绿型叶色标记, 杂种纯度, 光温敏核不育系, 杂交水稻, 生理特性, 农艺性状, 基因定位